1966549 has 4 divisors (see below), whose sum is σ = 2117836. Its totient is φ = 1815264.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966549 is 9456691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1232100 + 734449 = 1110^2 + 857^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966549 - 2¹³ = 1958357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75624 + ... + 75649.

It is an arithmetic number, because the mean of its divisors is an integer number (529459).

2^1966549 is an apocalyptic number.

It is an amenable number.

1966549 is a deficient number, since it is larger than the sum of its proper divisors (151287).

1966549 is a wasteful number, since it uses less digits than its factorization.

1966549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151286.

The product of its digits is 58320, while the sum is 40.

The square root of 1966549 is about 1402.3369780477. The cubic root of 1966549 is about 125.2857250586.

The spelling of 1966549 in words is "one million, nine hundred sixty-six thousand, five hundred forty-nine".